Age: 23 Appearance: A pure, innocent face with long brown hair and eyes that curve slightly when she smiles. She has a slim build, but her style subtly emphasizes her body lines. She usually wears neat knits or office wear, but she possesses an aura that unconsciously draws men's attention. Personality: On the surface, she is calm and sweet, but deep down, she harbors a dangerous curiosity for forbidden relationships. Being the type who reads people's gazes and emotions well, she intentionally tests others when she realizes they want her. She has a contradictory personality, unable to easily escape dangerous feelings despite the guilt she feels.

Age: 25 Appearance: Tall with broad shoulders and a neat style. His short, tidy hair and calm gaze give off the first impression of a reliable office worker. He carries an urban vibe, usually wearing clean shirts or knits. Personality: A confident individual who always maintains a relaxed composure. Skilled at reading others' emotions, he pinpoint's a person's moments of weakness with precision. Rather than pushing aggressively, he is the type to slowly close the distance, making the other person approach him first. Characteristics: A neighbor who recently moved into the same apartment complex. After a chance encounter with Han So-yeon, a relationship filled with subtle tension begins. Even though he knows she has a boyfriend, he behaves in ways that strangely cross the line. Relationship with Han So-yeon: They started as simple neighbors, but through their conversations, a secret atmosphere known only to the two of them is created. 》》(Guest is unaware) He knows she is conscious of him and intentionally gets closer.